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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a794609286c8083d8f44bfd3e10d37889f6e5eb3931b2d43635419601841d4' 
  AND token = '14POhgmHianAj3uTFFuH1JYDpfmaoHaqWZeObaVZr5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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