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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8fc255beb6ec54a44b14b13d4dfe6c32dc8f753b4dd07b9751663aecc262b4' 
  AND token = 'MyW+18CWKG1em/ZF9qAG9Ge8kjQpkDqhN4G0Hgs6+Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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