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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6386dbf53f89c1d3160f6e208f011955544616e582d16d1c2b24e4b8e6762441' 
  AND token = '0PN/uz88i3ARE8ozEgCEeD/4Eq9PUrPdN3Z9KELj8q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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