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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dadf8eabea4dd8857cb97b8a047ea60f2cefcbe94fb8f5e38540c6f2db02bb6c' 
  AND token = 'AwKbVk0PkkLE7R9VlVwMH/39pPVBcLS1H/VoaFA7mxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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