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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c0c1b65c49fdca3cffc965a06cca2c6acab343855410f0bdc3f8edac025679' 
  AND token = '+rZpNIA3Oz4C0taLtVqPphKQ6WHJ3inAi3UEaQWrh4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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