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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '945908c9c561bef73e547f413c0b78878d47d58d7c60f783c76ae36e8ef974f7' 
  AND token = 'H0ohrDit8eDFJAP+aQ0gqYj8OkZHpgx3YYqnr7cOJJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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