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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d1dc4715c755483af932f4ed74ccef71dec227436cd09c9aaeb38ea08c4435' 
  AND token = 'UVdsalJqp4+kWzLdJMHKu3PI/05hrWThK7CawnfFta8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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