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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c17dbcad316fbdc70304ddfadc07f29544aa79296f3b6eb7712a0a0cc1a2e73' 
  AND token = '3aH+j2BriMa8JfD9r8MBdNQRocmQUGmVip0vUtEOZDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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