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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c4479efe04dad410842808d6863eb3f77c28bcc84bf99d599ec8333577edec' 
  AND token = 'hBD8brAgdaDTx4sK7NEHJtNb2e9Pz0EwwtXyhC4g67s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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