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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cccee9e07c23083d6c825248c047dbe8fc8c2ed24b0836c4233e839f450fef6' 
  AND token = 'rb7SySavNYlXaI+SpFgwJoFtaZVJZI0LGhqFPyMMknk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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