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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8500d6f912bfffe673b66cfc364d76787ec4a80d9a20478f7ff61e1b750167f3' 
  AND token = 'nAx9ktZ+8OVDxXxRO/CgQ1qkGB6n9DKrf7e+Zirbqgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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