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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00ebb0e1f1b02d2c26e70304f3aed63032b646c4c5d6b7b2b3ec0ae6dcb0b775' 
  AND token = '9KRBYhngQq6OMeMgihETkJDP2xAmsPjVf1dMW6mVc08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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