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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced7ae02b48bcb7510f49219a97ff3f215bf65355473cd0fca20d8012a25e431' 
  AND token = 'v9m3ovRAwJ4o6R7fxSHAAqiFxeAdBEiGWv4u4zp8juQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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