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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '865d6a31471eee7c638bf6004283bf7378bda0ce1dcb37dccbde535635f05949' 
  AND token = 'UATCoZHHVcEpJFeqW9D4QTOd5AECPVgI5VbuKmhJeFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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