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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809b451070d6ffc3eaff4f6eecc26215a866353ee5c19c762d859effc6929f30' 
  AND token = 'kqduwDCtJX5xDsEFqvCp8vCth8fg9NMsSV39knHrlIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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