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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e4ed8e1f0f2e928b985af796f99718a320607773788a80fd912e393a44bcd8' 
  AND token = '8PMSz4WG1cFIihFzE2j49c2LtzWVdHwAJAD271w0VI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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