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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e31e9d9d3d2ad0425b42ae9b9eb5aa000bcc201a0ee34a1b3cde642e031fcda' 
  AND token = 'qrSzbqiF7Vf4QUENMruaXo5rEqUWTc7OOER7euOMMos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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