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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec215fdc7969ca7f8b682a737f613dc1e63d410a67444a98e8a401fa984013ab' 
  AND token = 'eCCHag0pUhV5L3l5gVt2eZJZZriTzRmxSywwj1tnbyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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