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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92eff91b191d4f64516c15d894e2970f070795d14e5674e448dc3113ec90745b' 
  AND token = 'i0VN0RTYVg2nE+sVcXJi0D8zfAzxWm+hsW4vJa8KyxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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