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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f7b446203e58a5f7fd8dfb4b8c39aea30d964ad3dacabea8fb4233751933f4a' 
  AND token = 'tsRbcQCuYT9oUt/z2TETJBZE+TCSODo9AZhVWjOKzo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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