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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b862bd21b49a858fdf205a2dd5af80870736839595b0d92a0592f7f237984d0' 
  AND token = 'djanJim2HIT9wd8WZi5f7h97nqrWAvetBi4fIAdL2E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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