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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a76a2085ebf3e73e0d072e8c6067751eaff900cd9cb520afa67934a050472f' 
  AND token = 'QeNC6GABeZog6j/+3Y7pbCxNWWuHzL5jWyXomuT9I80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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