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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3142861f41483c7d95bb3d3fd9e79b2ef96ea1090f241e8fa381ad321b2796' 
  AND token = 'vWhzupAaZ2eSTidLnbHxe7ECaCSQIvNIFcFX2Q0at7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00157

JSON explain

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