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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '668862d543fe17ba3480817db7185fe9318a0da5b23abdd805876189402db663' 
  AND token = 'DPYJnhu4INmPyXe/99bf5RdS7RgSJ7t5c9LyDK4x1FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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