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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99be3e5acacfe548f8fa6e24a6c3da0bbd1372d124eae1a442081b51734e23a5' 
  AND token = 'F9Qa0PK51+rVYItw3MRvQqYFN1L/e6oFb/LZznJgU5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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