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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d9c7df1229413286ea6e87f2fbee2076b0451a60f77c7c3484c744217019d0e' 
  AND token = '/lNEDjL81Gzxl/3YmEM91rbIgC/9HayGS6odU7zlGZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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