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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51b621aa06dafe3ebbc209b31e10a6352bcf3839c345d3e33437fbda061999f2' 
  AND token = '7VC6CnDy5sqH0Sj2LVgj7E9Gk8to6txd9y+MaZMyFkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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