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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59d8e35cae2d59991e1e18d25823255a341094dae23f97b0603e67ce6b791d20' 
  AND token = '5YtFPrp9RwnNivx6Z7ZBTNN/hKM5OReHdrmyAPZS9yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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