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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a2e7be82e89ff603c0e3804fe99a5eaf3b21ab2616a4dd599c74d57bc8ba8af' 
  AND token = '6uADapehKDFQ7AGhxb+LnU9qZ1T2v2eYh4rkwWgK+P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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