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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c3c14fe6074527a6172f5e7f73ecfae7a7ccd0360590d9d194678b4463a4d0' 
  AND token = 'fbcerlPtVsDMIXZGMgjiQ3PASyO0eEjoB5HBxM3xSJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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