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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e36295456536e65aeb1df84558ab5632d997015179c035f6ce6d19808010026d' 
  AND token = 's68L4b4JNLnShchwyND9ZOxasW9M8RokiXoMWs6ND6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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