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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b4c098aaacfe44a7fb139484bbe17af7f1a20dd45dc43c4b790e5cfac17905' 
  AND token = 'AekMI9v2eJ60KF/ZRORYfnF5PqQ6yxgUf7Mc2EgDWYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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