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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb9ca502303286bec86d30591069e1685c802bb979b4bce30c64f05c4cf40e0' 
  AND token = '9Gt/5DqdNp4/mLtqNUkPuMwz3cilqVi1wZ9ZN/wIAWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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