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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f66f2145f2e3870224a5c001aea13fe402db4db5a67b1b30bb145be11341ca' 
  AND token = 'OlYXSrwkcjBJrXPWd2HlROgeZ23Jox2ZKiarbdlEayo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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