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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11cdc800f15af589e495cb81a05b43ab9f7c7df7601208fa2b7f1b156ba9093' 
  AND token = 'plOdmUchmQDjGVJ8UEsDpAKQKLmvVwCLfpfkIkhe2cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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