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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976d3dcb64e3391592391036d708d87010ff8037a0bb9d016ca1f759430ca13c' 
  AND token = 'lAYIeVA6YM+I8AOt0ApJRH/mSsFIjUIviEGwj/hJSAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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