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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c19cff9d4acab55f3ec1a2f31bbcc2586aa8942334ae281667d800699ca381e2' 
  AND token = '9Dybq9QkbFKbILmL+pClm9egb7ALunoeU0f5eDDNu5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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