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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09364e8ae7a8b62b3bc11bad2e50cdf2e436c158242d148af52f96a2103cddd4' 
  AND token = 'NwQ9FeI3Iwo83Tp3vVPx36r3ORq9Duk4DQEmJNZl6Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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