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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c25ab3c02c85fdf148371802f59d5274c82742c70c0d2df2bf03b4ca5a54a5' 
  AND token = 'Bx9C3mmpXRqMb8IPf2+YgVU8dpG9wBKDlTcohne7838=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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