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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d19c667cbe9b567b1e210da0addd7f709f331408799f65ed8525c47c571fa26' 
  AND token = 'zO7KNbZKisj/QZqy36hnMEsZmYRDaP2cyrjzWrzKano=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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