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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d907fe4f1dbad71bca76366189111ba7a4fca575340214923f8bf5034a3876' 
  AND token = 'jqLd6HMeaTjGgqm6w66gsYhraY2gbxMqlHtDJMLqrb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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