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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72a9bfd779af37bf998cc4b9c71c48907bf1e5e9dbfee33de3015d5e1541353a' 
  AND token = 'rT8mlTXMH1zfQXQDk6MwPJWLKR2mwQ0/+3QSVKHzHDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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