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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30142a01c32cd9d7a7023433a03027ca08f3b995d9b3aee778866a34e14371f8' 
  AND token = 's+2egd2YyVhqWvCDJJcRvTNvPdY+2MKl68ndvxjlZNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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