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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '356e860e7217e3969a0d820e9f886835eea1f2607bc4faed14d928672fe16bd0' 
  AND token = 'ovgXZKJfZP1vm37xT3nzQoHrTUegonTp3I+JnvB50ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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