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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a164fd8ca98d7037e16a30e6880c59ff74cd63bec7e2dcd28a56d24d6a33c1' 
  AND token = 'lgopkAMw2YWU6BTN06QuXE8VpyA+CeHKQreLNI/KMjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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