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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c4fffac119a2a2753d04c7df5f9ccfff5d98a2d82fe621172ac5f7c0255891e' 
  AND token = '71Uo1tK0DgZpial9P1jjcoXMSzSCbjS9vERhj+H2JOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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