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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f7e98eeedbd660cd3adeba1dca1afd01cc4d46cf6edf2d9c8acf605f6c68f7' 
  AND token = 'EA/7lMTh2Zbm6CB1gnL62HIpZZszH7OGuQPCoad3hYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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