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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c308c06761ecb347dcce9e5ab71a44965f3f7d5050c1f08a94959a0b52f36deb' 
  AND token = '2c1S1qMwJeVnAQdNBzoLYq0N6rT73wlMxLkd3Ih17O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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