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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ea2c30d6b1799139a2d57ebac791260a1ec9a967f77f3d7c021d86676c950c2' 
  AND token = '9wUxAclCzGutuZevXfBtGir5MBArNWc5Tus9vPS/8bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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