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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '421da9627b50e1e248c42743f63abb063c9524d0030afc061dcd9048407d877f' 
  AND token = 'f+Rk1jt9Dnx9gWPNOwiOBYOvCupVKQkmBePagefbYbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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