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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a62370b755ac0587fa3ec4f1a9991c5b303b2dd79caa4522e556efd6255816e' 
  AND token = '4y1dhx7EOD73gxVE3+TwF/H5+aG3H16w5ROXss49pRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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