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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7926cb2aaf721e400da097b46ec05a9c103f2140228bdbe3b305aad69f7e59' 
  AND token = '36rR06e7FAn+VmBGg0XI3iXO1V2TK/moUrzuVbL5u4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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