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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a37c07183de3265f7784e8077bb117f84c969098f8d5e2bc308c7d0d5216f0b' 
  AND token = '3634dT9bIoJ5bz3jwR1+p1alhyi3xqRsrQkGCXaUazQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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