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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba9ad730b54bba5b3cae1ad1f361702208ff3f1b6821b94ec87b3ac74ca65f5' 
  AND token = 'OUZ6rAuKJ70vvHbPRkFSND9hNGSV1zNc0TROKR9joQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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