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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7d0931df007ecb1beff4e23e2653123088aa36885df7ac79005a59ed18e7c4' 
  AND token = 'pWUL5p8ueJevoB3XVqEHv0TtpxspPXzIN+Qf3dOrgZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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