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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0db36c523f0b4b27b0c61d9657280336e8c94380b93417d7d4536e345360f9f' 
  AND token = '/hhLzsY2sE9kv60eMAZW6Lqip2ehFIMmrq+hPFTek68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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