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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe4a5af603ba6d0dd19b1cfc734044c0f20bf5ab4ec4b235302816c1f1dd06e' 
  AND token = 'eo/O2bc8xay0HMoMXVTkelYCsOnQRTyJaFPfRjV1XE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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