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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f4d16ec0f8310f715e6e2697cd029861b2c819f71bb6f8915c47dbc022ce40' 
  AND token = 'jtxfD2z/WKn3le/EmfPbgxoYjmvA7heF+328WnJvDfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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