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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f96d4b122941219e29ff6633a377042a9080d3812d07713369005a8ba0efe7' 
  AND token = 'QyGEzljO71q9su1it7aq5ZyvxkK12lOxOD2MxpEKsj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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