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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82496b3805e5325f2cccef44b85bcfbc69843b973e91777814a453d70cfce5d' 
  AND token = 'PDYn8J5R1rhL+BmS1hoW7G8XhH6ouob5DpXSENUQH9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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