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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1469e43d7c7756da43bdfb21351407c05289898d8c05180ae782b8a86d3f099' 
  AND token = 'v1xPzSMZisoMSdDn5dAkzDSCfUx34ufGLMi9tNdwG7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}