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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '419cf58b4a35cfdc5c6b74dd311d9a04522f25889009097eeab77924ff758160' 
  AND token = 'QaX6jbW4TkrGWU0/9Sp+tbTzNA2JEG7gMqfer/5/Jeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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