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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269094580b56abccde8cb621badde51a215350db1e15a06d511f9d04d21f1b06' 
  AND token = 'mOGmDqmNI2vdi9G11z7ChcxFzZxjOm5JUolTy1cJHf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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