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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b7f9f6b2b93ec3b31d00f6490549f93edb18b2bcf4bf4d8e8cc1c33dd1e99db' 
  AND token = 'asshgHORey2Jo/kKBHHctbQrPcW3DyvtqXCybxhHqv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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