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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3fdb978c005a5db975a7b64dd9bc1c8b8b85cce09a06b5c49be85597a6511a4' 
  AND token = 'oNeCAIf68JnHsU4bftwtbZXhMZDX2M19Mhw5fp343Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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