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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '932215775e5c6143a7cd66834d4fed8f0e6474cfb45291c2c5a59f2d0e7b25aa' 
  AND token = 'oEo9Qri7QcdzGD38hLCb5JmNbcZQXiCqo1h2D52M6SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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