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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392435ad7a6526310f388007f6ed6f22c9b4c406df239287f6d835f75b98cfd8' 
  AND token = 'TATWYoH+Fa/QFW1oBBt2BZoo3rtiZn1lJYXKWYaBUYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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